The North American and Worldwide versions of this set contained 104 cards. Europe initially received the North American English set, i.e. the set with cards numbered MRL-XXX. A European English version was later released containing 27 more cards, which had been excluded from the European version of Legend of Blue Eyes White Dragon.

The rename from Magic Ruler to Spell Ruler was to go with the renaming of Magic Cards to Spell Cards, to avoid similarities with Magic the Gathering. The European and Worldwide English versions of the set used the name Spell Ruler. The European version used the set ID MRL, despite the packets reading Spell Ruler, while the Worldwide version used the ID SRL.